If you can do just one thing to prevent duplicate payments in your accounts payable process, this is it. Implement a comprehensive, rigid coding standard and mandate its use no exceptions whatsoever. You’ll see what happens to your duplicate payments and you’ll like what you see.
But following this one seemingly simple step is not quite as easy as it might first appear. However, those that manage to do it take a serious chunk out of their duplicate payment dilemma.
(c) 2009 Mary Schaeffer